Malicious PDF — malware analysis report

Static analysis result for SHA-256 736224c7c0468884…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 15:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6df6a5240126aa8c7b6b277da3f9e9d6 SHA-1: 9c74e4a09e08ce1fd8b9887e3bbffb648a569ab1 SHA-256: 736224c7c0468884776a178a9b3ecdf46b0a68137f420c9435b36481d8b68cfe
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=secret+messaging+on+android PDF link annotation
    • https://metrosecuritynepal.com/assets/userfiles/files/93456806393.pdfIn PDF document text
    • http://bienbao.org/uploads/files/22126591583.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/96211102037.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/75930774560.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/tipegixigazobiweso.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/4758299063.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vujoluluw.pdfIn PDF document text
    • http://espokebar.com/uploads/files/kawebadixenazirub.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zoxipewajiv.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///94359793457.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/52721533768.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaruped.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/72390104901.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/36350792778.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/febukokoxese.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/12889331560.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090305463073499.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/75750768574.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/28642607665.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/80097832012.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jugulipipesarabidis.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/80385766621.pdfIn PDF document text
    • https://ckmandarin.com/uploads/29435061807.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/diwoselabolimixobobewa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 10740 bytes
SHA-256: c2022db7baf0bd638d9d34fd6f737327c9b42fee5a3ebe67ea16360d606026ed
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 17488 bytes
SHA-256: fc68e3b47ea26e9bc7e06743b65d018805883bfeb4d22a04942629138360c266
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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